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Equity-Accounted Investments And Other Long-Term Assets (Narrative) (Details)
R / shares in Units, $ in Thousands, item in Billions, R in Billions
3 Months Ended 12 Months Ended
Oct. 04, 2018
USD ($)
item
Jul. 11, 2018
shares
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Sep. 30, 2018
ZAR (R)
R / shares
Sep. 30, 2018
USD ($)
Market value of holding       $ 88,331 [1]   $ 94,241
Unrealized holding gains     $ 1,551 $ 1,395    
Finbond [Member]            
Share price | R / shares         R 3.60  
Market value of holding         R 1.0 $ 72,000
Equity-accounted investments, ownership percentage       29.00% 29.00% 29.00%
Finbond [Member] | Capitalization Share Issue In Lieu Of A Dividend [Member]            
Number of additional shares acquired | shares   6,602,551        
V2 [Member]            
Percentage of ownership interest 50.00%          
Equity acquisition amount under purchase agreement $ 2,500          
Contribute amount 2,500          
Working capital facility $ 5,000          
V2 [Member] | Minimum [Member]            
Number of underbanked citizens | item 1          
Cedar Cellular [Member]            
Maturity date     Aug. 01, 2022      
Unrealized holding gains     $ 1,551 $ 1,395    
Cedar Cellular [Member] | 8.625% Notes [Member]            
Equity-accounted investments, ownership percentage       7.625% 7.625% 7.625%
Interest rate       8.625% 8.625% 8.625%
Cedar Cellular [Member] | 19.15% Notes [Member]            
Interest rate         19.15% 19.15%
Cell C [Member]            
Equity-accounted investments, ownership percentage       15.00% 15.00% 15.00%
DNI [Member]            
Interest rate         6.30% 6.30%
[1] Certain amounts shown here do not correspond to the Company's 2018 financial statements and reflects an adjustment made, refer to Note 1 See Notes to Unaudited Condensed Consolidated Financial Statements